Table 2.

Average (± standard error) aboveground net primary productivity (g m⁻² year⁻¹) of cultivar and local ecotype sources of each focal grass species and all focal grasses in each species pool averaged over the 4 years of study.

	Species pool A	Species pool B	Species pool C
Andropogon gerardii
Cultivar	124 ± 48	38 ± 8	74 ± 23
Local ecotype	133 ± 28	62 ± 28	75 ± 25
Sorghastrum nutans
Cultivar	382 ± 49	427 ± 88	530 ± 74
Local ecotype	415 ± 70	449 ± 74	350 ± 110
Schizachyrium scoparium
Cultivar	58 ± 16a	27 ± 9	40 ± 11
Local ecotype	22 ± 8b	18 ± 5	35 ± 13
All focal grasses
Cultivar	564 ± 28	492 ± 101	644 ± 101
Local ecotype	571 ± 66	529 ± 59	460 ± 113

Source means within a species pool accompanied by different letters were significantly different (α = 0.025).